CA2920414C

CA2920414C - Hose clamp

Info

Publication number: CA2920414C
Application number: CA2920414A
Authority: CA
Inventors: Robert SEELOS
Original assignee: Oetiker Schweiz AG
Current assignee: Oetiker Schweiz AG
Priority date: 2013-08-20
Filing date: 2013-08-20
Publication date: 2018-07-24
Anticipated expiration: 2033-08-20
Also published as: MX2016002069A; JP2016534300A; PL3036468T3; EP3036468A1; CA2920414A1; RU2628252C1; US20160201834A1; ES2704690T3; US10066772B2; CN105659018A; KR20180053428A; KR20160033171A; JP6155396B2; EP3036468B1; WO2015024592A1; CN105659018B

Abstract

An open hose clamp has a tightening device in the form of a so-called Oetiker ear 24. The tightened condition is locked by means of toothed sections 15, 23 which engage one another outside of the ear region on the side of the ear remote from the outer clamping band end. In the locked condition, the ear is relieved so that the hose clamp does not lose its clamping function even if the outward protruding ear 24 is damaged. The width of the clamping band in the area of the ear is reduced compared to the otherwise full clamping band width.

Description

HOSE CLAMP
Field and background An example of an open hose clamp is known from WO 2013/060346 Al. In the known clamp, the inner end section of the clamping band has on its outer side a first toothed section which, in the tightened condition the hose clamp, engages in a second toothed section formed on the inner side of the outer end section at the side of an ear-type tightening device remote from the outer clamping band end. The ear-type tightening device only serves to tighten the hose clamp during installation, which may be done automatically or manually by means of a plier-type tool common with ear clamps. In the mounted condition, the holding forces produced during tightening are taken up by mutually engaging toothed portions while the ear is relieved.
Since the toothed portions, which effect a locking, are arranged outside of the ear region the installed hose clamp can safely fulfill its function even when the outward pro-jecting ear is damaged.
Summary It is the general object to improve the known hose clamp. It is a more specific object of selected embodiments to reduce the force required to tighten the clamp.
Certain exemplary embodiments can provide a hose clamp comprising a clamping band having an inner end section overlapped by an outer end section, a closure device which in the closed condition of the hose clamp holds both end sections in mutual engagement, an ear-type tightening device provided in the clamping band and having two outward projecting legs interconnected by a web, and a retaining device which, in the tightened condition of the hose clamp, retains the inner end section of the clamping band in engagement with the outer end section on the side of the tightening device remote from the outer clamping band end, wherein the clamping band has a smaller width in the area of the tightening device than elsewhere, to reduce the force required to tighten the hose clamp.

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¨ 2 ¨
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The reduction of the clamping band width in the area of the tightening device is made possible in an embodiment by the fact that the tightening device has to perform its function only during installation whereas, in the tightened condition, the holding forces are taken up by the toothed portions and the tightening device is relieved. Due to the reduced width in the area of the tightening device, the tightening process can be performed with a correspondingly smaller force. This again allows the use of smaller installation tools.
At the same time, in maintaining the closing force, higher forces are exerted circumferentially thereby effectively increasing the radial forces relevant for the tightness of clamping, as compared to an ear clamp with no reduced clamping band width in the area of the ear.
Other arrangements result in the advantage that the same tightening tool can be used for a plurality of hose clamps of different clamping band widths.
Brief description of the drawings An embodiment of the invention will be explained in more detail below with reference to the drawing, in which:
Fig. 1 is a perspective view of a hose clamp in the closed but not yet tightened condition;
Figs. 2 and 3 are perspective representations of the hose clamp of Fig. 1 in the flat condition, viewed from what is, in the closed condition, the inner and, respectively, outer side of the clamping band; and Fig. 4 is an enlarged plan view of the outer band end of the hose clamp shown in Fig. 3.
Detailed description The hose clamp shown in the drawing consists of a clamping band 10 which, starting from the end 11 at the upper left side in Figs. 2 and 3, has the following elements: A tongue 12 having a width smaller than the full width of the clamping band 10, a first toothed section 15 formed on the tongue 12 and facing outward in the radial direction of the closed clamp, a projection forming a support hook 16, a ¨ 2a guide hook 17, an integrated securing hook 18 against unintentional opening of the clamp, a cover portion 19 bent out of the clamping band, a raised portion 22 following a step 21, a second toothed section 23 facing inward in the radial direction of the closed clamp, a tightening device 24 in the form of a so-called "Oetiker ear"

having two legs 25 extending outward in the radial direction and interconnected by a web 26, a recess forming a support hook receiver 27, a guide hook receiver 28 and an outer clamping band end 29.
The support hook 16 is formed with a longitudinally extending guide web which is received in a longitudinally extending guide web receiver formed in the support hook receiver 27. This structure ensures that the tongue 12 is aligned with the second toothed section 23. Otherwise, there would be the risk that the tongue does not centrically engage the second toothed section 23 during assembly.
The hose clamp, which is closed when delivered, is placed on the object to be clamped, which may be a pipe nipple surrounded by the end of a hose. The _ 3 ¨
hose clamp is subsequently tightened by narrowing the ear 24 by means of an automatic or manual tightening tool such as a pair of pliers engaging both legs 25, whereby the two toothed sections 15 and 23 are brought into engagement. This engagement causes the hose clamp to be locked in the tightened condition in which the ear 24, which is now outside of the tightening area, is relieved.
Even damage caused to the outward projecting ear has then no longer any essential influence on the holding function of the hose clamp.
From the closed condition of the hose clamp shown in Fig. 1, the tongue 12 moves during tightening process to the area under the cover portion 19 until the 113 subsequent portion of full clamping band width is near the step 21. In this condi-tion, the object to be clamped is surrounded by the full band width of the hose clamp without any steps or gaps substantially over its entire circumference.
As seen especially in Fig. 4, the width of the clamping band is reduced in the area of the ear 24 by at least 10 per cent, preferably 20 per cent, compared to the full band width. Although the reduction of the band width causes a weakening it is permissible because, as explained above, the ear is basically relieved in the installed condition in which it is finally used. On the other hand, the reduction of the band width means that a smaller force is sufficient for tightening the clamp and achieving a predetermined diameter reduction, e.g. by means of a plier-type tool engaging the legs of the ear, as compared to clamps having a constant clamping band width throughout.
Typical clamping band widths are 12 mm, 14 mm and 16 mm. If in all such hose clamps the band width in the area of the ear is made 12 mm the same tight-ening tool can be used for all hose clamps.

¨ 4 ¨
Bezugszeichen clamping band 11 inner clamping band end 12 tongue first toothed section 16 support hook 17 guide hook 18 securing hook 19 cover portion 21 step 22 raised portion 23 second toothed section 24 ear leg 26 web 27 support hook receiver 28 guide hook receiver 29 outer clamping band end

Claims

1. A hose clamp comprising a clamping band having an inner end section overlapped by an outer end section, a closure device which in the closed condition of the hose clamp holds both end sections in mutual engagement, an ear-type tightening device provided in the clamping band and having two outward projecting legs interconnected by a web, and a retaining device which, in the tightened condition of the hose clamp, retains the inner end section of the clamping band in engagement with the outer end section on the side of the tightening device remote from the outer clamping band end, wherein the clamping band has a smaller width in the area of the tightening device than elsewhere, to reduce the force required to tighten the hose clamp.

2. The hose clamp of claim 1 wherein, in the area of the tightening device, the width of the clamping band is reduced by at least 10 per cent as compared to the full band width.

3. The hose clamp of claim 1 or 2, wherein the retaining device has a first toothed section provided on the outer side of the inner end section of the clamping band and a second toothed section provided on the inner side of the outer end section on the side of the tightening device remote from the outer clamping band end and engaging the first toothed section in the tightened condition of the hose clamp.

4. A set of a plurality of hose clamps in accordance with any one of claims 1 to 3, wherein the clamping bands of at least two hose clamps have different widths but the width in the area of the tightening device is the same in all hose clamps.

5. The set of claim 4 including hose clamps the clamping bands of which have widths of 12 mm,14 mm and 16 mm, and all hose clamps have a band width of 12 mm in the area of the tightening device.